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        <span class="post-time"> 0001-01-01 </span>
        
        
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  <ul>
    <li><a href="#贪吃蛇小游戏说明">贪吃蛇小游戏说明</a>
      <ul>
        <li><a href="#设计思路snake_eatc">设计思路(snake_eat.c)</a></li>
        <li><a href="#实验结果">实验结果</a></li>
        <li><a href="#实验文件">实验文件</a></li>
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    <div class="post-content">
      <h1 id="贪吃蛇小游戏说明">贪吃蛇小游戏说明</h1>
<h2 id="设计思路snake_eatc">设计思路(snake_eat.c)</h2>
<ol>
<li>将这个过程分为不断添加食物、不断输出棋盘、不断取指令、游戏结束：</li>
</ol>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre class="chroma"><code><span class="lnt">1
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<td class="lntd">
<pre class="chroma"><code class="language-fallback" data-lang="fallback">//主函数
int main()
{
    addFood();
    output();
    operation();
    gameover();
}
</code></pre></td></tr></table>
</div>
</div><ol start="2">
<li>细化这些步骤:</li>
</ol>
<p>添加食物：</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre class="chroma"><code><span class="lnt"> 1
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<td class="lntd">
<pre class="chroma"><code class="language-fallback" data-lang="fallback">void addFood()
{
    int x, y;
    srand(time(0)); //在随机的空白位置产生一个食物
    do
    {
        x = rand() % 21 + 1;
        y = rand() % 21 + 1;
    } while (map[y][x] != BLANK_CELL);
    map[y][x] = SNAKE_FOOD;
}
</code></pre></td></tr></table>
</div>
</div><p>输出要输出整个棋盘：</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre class="chroma"><code><span class="lnt"> 1
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</span></code></pre></td>
<td class="lntd">
<pre class="chroma"><code class="language-fallback" data-lang="fallback">void output()
{
    printf(&#34;\n------------Gready Snake------------\n&#34;);
    for (int i = 0; i &lt; 12; i++)
    {
        for (int j = 0; j &lt; 12; j++)
        {
            printf(&#34;%c&#34;, map[i][j]);
        }
        printf(&#34;\n&#34;);
    }
}
</code></pre></td></tr></table>
</div>
</div><p>不断取指令，要对指令的合理性进行检验，并进行指令译码：</p>
<div class="highlight"><div class="chroma">
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<td class="lntd">
<pre class="chroma"><code class="language-fallback" data-lang="fallback">void operation()
{
    char c;
    char lastc = &#39;d&#39;;
    int addX = 0;
    int addY = 0;
    int flag;

    printf(&#34;Please input the operation(WASD/wasd): &#34;);
    while (scanf(&#34; %c&#34;, &amp;c)) //不断读取指令
    {
        flag = 0;
        switch (c) //判断方向
        {
        case &#39;a&#39;:
        case &#39;A&#39;:
            if (lastc == &#39;d&#39; || lastc == &#39;D&#39;)
            {
                flag = 1;
                break;
            }
            else
            {
                addX = -1;
                addY = 0;
                break;
            }

        case &#39;d&#39;:
        case &#39;D&#39;:
            if (lastc == &#39;a&#39; || lastc == &#39;A&#39;)
            {
                flag = 1;
                break;
            }
            else
            {
                addX = 1;
                addY = 0;
                break;
            }

        case &#39;w&#39;:
        case &#39;W&#39;:
            if (lastc == &#39;s&#39; || lastc == &#39;S&#39;)
            {
                flag = 1;
                break;
            }
            else
            {
                addX = 0;
                addY = -1;
                break;
            }

        case &#39;s&#39;:
        case &#39;S&#39;:
            if (lastc == &#39;w&#39; || lastc == &#39;W&#39;)
            {
                flag = 1;
                break;
            }
            else
            {
                addX = 0;
                addY = 1;
                break;
            }

        default:
            flag = 2;
            break;
        }
        //异常处理，错误输入和错误移动：
        if (flag == 2)
        {
            printf(&#34;Invalid Input! Please input again(WASD/wasd): &#34;);
            continue;
        }
        if (flag == 1)
        {
            printf(&#34;Invalid Move! Please input again(WASD/wasd): &#34;);
            continue;
        }
        //游戏终止条件判断，1继续，0返回
        if (!GameRun(addX, addY))
        {
            break;
        }
        //继续输出
        output();
        printf(&#34;Please input the operation(WASD/wasd): &#34;);
        //保存上次的输入操作值
        lastc = c;
    }
}
</code></pre></td></tr></table>
</div>
</div><p>游戏结束：</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre class="chroma"><code><span class="lnt">1
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<td class="lntd">
<pre class="chroma"><code class="language-fallback" data-lang="fallback">void gameover()
{
    printf(&#34;Game Over!\n&#34;);
}
</code></pre></td></tr></table>
</div>
</div><ol start="3">
<li>进一步细化内部逻辑</li>
</ol>
<p>在不断输入的过程中，判断游戏停止的条件（胜利或失败）：</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
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<td class="lntd">
<pre class="chroma"><code class="language-fallback" data-lang="fallback">int GameRun(int addX, int addY)
{
    char next = map[snakeY[snakeLength - 1] + addY][snakeX[snakeLength - 1] + addX];
    //失败判断
    if (next == WALL_CELL || next == SNAKE_BODY)
    {
        printf(&#34;You failed! \n&#34;);
        return 0;
    }
    //吞食
    if (next == SNAKE_FOOD)
    {
        if (snakeLength &gt;= SNAKE_MAX_LENGTH) //成功判断
        {
            printf(&#34;The snake length is over 20. You win!\n&#34;);
            return 0;
        }
        Move(addX, addY, 1); //增加长度的移动
        addFood();
    }
    else
    {
        Move(addX, addY, 0); //不增加长度的移动
    }

    return 1;
}
</code></pre></td></tr></table>
</div>
</div><p>在判断游戏停止的过程中，要随时输出这一个操作所导致的棋盘上的蛇的变化，因此模块化出移动蛇的函数：</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
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<td class="lntd">
<pre class="chroma"><code class="language-fallback" data-lang="fallback">void Move(int addX, int addY, int mode)
{
    if (mode == 1)
    { //增加长度
        snakeLength++;
        map[snakeY[snakeLength - 2]][snakeX[snakeLength - 2]] = SNAKE_BODY; //原来的头变成身体
        snakeX[snakeLength - 1] = snakeX[snakeLength - 2] + addX;           //找头的位置
        snakeY[snakeLength - 1] = snakeY[snakeLength - 2] + addY;
        map[snakeY[snakeLength - 1]][snakeX[snakeLength - 1]] = SNAKE_HEAD;
    }
    else
    {                                                                       //不增加长度
        map[snakeY[0]][snakeX[0]] = BLANK_CELL;                             //蛇尾去除
        map[snakeY[snakeLength - 1]][snakeX[snakeLength - 1]] = SNAKE_BODY; //原来的头变成身体
        for (int i = 0; i &lt; snakeLength - 1; i++)
        { //蛇身整体移动一格
            snakeX[i] = snakeX[i + 1];
            snakeY[i] = snakeY[i + 1];
        }
        snakeX[snakeLength - 1] += addX; //找头的位置
        snakeY[snakeLength - 1] += addY;
        map[snakeY[snakeLength - 1]][snakeX[snakeLength - 1]] = SNAKE_HEAD;
    }
}
</code></pre></td></tr></table>
</div>
</div><h2 id="实验结果">实验结果</h2>
<p>篇幅原因，仅举一例，其他所有操作全部符合条件，还会有异常处理：</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
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<td class="lntd">
<pre class="chroma"><code class="language-fallback" data-lang="fallback">------------Gready Snake------------
************
*          *
*          *
*          *
*     X   $*
*     XXXH *
*          *
*          *
*          *
*          *
*          *
************
Please input the operation(WASD/wasd): d

------------Gready Snake------------
************
*          *
*          *
*          *
*         $*
*     XXXXH*
*          *
*          *
*          *
*          *
*          *
************
Please input the operation(WASD/wasd): w
</code></pre></td></tr></table>
</div>
</div><h2 id="实验文件">实验文件</h2>
<p>该目录下的snake_move.c和snake_eat.c。</p>

    </div>

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